<?php
		session_start();
        //生成验证码图片
		header("Content-type: image/png");
		// 全数字
		$str_title = "1,2,3,4,5,6,7,8,9,0";      //要显示的字符，可自己进行增删
		$list = explode(",", $str_title);
		$cmax = count($list) - 1;
		$verifyCode = '';
		for ( $i=0; $i < 4; $i++ ){
		      $randnum = mt_rand(0, $cmax);
		      $verifyCode .= $list[$randnum];           //取出字符，组合成为我们要的验证码字符
		}
		$_SESSION['custpyzm'] = $verifyCode;        //将字符放入SESSION中
		//$this->Session->write('custpyzm',$verifyCode);
		//$this->log("init:".$_SESSION['custpyzm']);
		$im = imagecreate(58,28);    //生成图片
		$black = imagecolorallocate($im, 0,0,0);     //此条及以下三条为设置的颜色
		$white = imagecolorallocate($im, 255,255,255);
		$gray = imagecolorallocate($im, 200,200,200);
		$red = imagecolorallocate($im, 255, 0, 0);
		imagefill($im,0,0,$white);     //给图片填充颜色
		 
		//将验证码绘入图片
		imagestring($im, 5, 10, 8, $verifyCode, $black);    //将验证码写入到图片中
		 
		for($i=0;$i<200;$i++)  //加入干扰象素
		{
		     imagesetpixel($im, rand(0,255) , rand(0,255) , $black);    //加入点状干扰素
		     imagesetpixel($im, rand(0,255) , rand(0,255) , $red);
		     imagesetpixel($im, rand(0,255) , rand(0,255) , $gray);
		     //imagearc($im, rand(0,255), rand(0,255), 20, 20, 75, 170, $black);    //加入弧线状干扰素
		     //imageline($im, rand(0,255), rand(0,255), rand(0,255), rand(0,255), $gray);    //加入线条状干扰素
		}
		imagepng($im);
		imagedestroy($im);
        
?>